/Engine/Source/Runtime/Engine/Classes/Kismet/KismetMathLibrary.h
Converts from linear to 8-bit RGBE as outlined in Gregory Ward's Real Pixels article, Graphics Gems II, page 80.
static [FColor](API\Runtime\Core\Math\FColor) LinearColor_ToRGBE ( [FLinearColor](API\Runtime\Core\Math\FLinearColor) InLinearColor )